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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

Sorry, I thought you were asking about rsa private keys, but you're not, so my original answer is irrelevant... Can't think of a positive reason to see what you're seeing, doesn't fit in with common sense, unless maybe ssh is not able to read back the contents of the file? Not sure that really makes any sense TBH, but what are the rights on the file and ~/.ssh? also what if you set StrictHostKeyChecking to yes or no? Certainly appears to be client side, so add on a whole heap of -v's to the ssh command and read through the output too.

And this is not a networking question, it's not about routers, switches, ip addresses. moved to Linux - Software.

So 'bchittenden' has full access to the file. Furthermore, the known_hosts file is getting written to every time I try to log in to the other box, so I'm pretty sure that it's doing the checking under the correct owner.

Quote:

also what if you set StrictHostKeyChecking to yes or no?

It doesn't complain as loudly, but it still isn't working as I'd expect it to...

Still baffled. Could it be that the host key on $cribbage be type 1, and the ssh client on prodcbridge01 is only checking type 0 and type 2? (I'm speaking out of alternative orifices here, I don't even know what types 0 and 2 are, or if type 1 even exists).